If you have multiple data tables on a single page:
The data for all tables gets loaded on initial page load (including the hidden tabs).
When switching tabs, the new (now visible) and previous (now hidden) tables both get refreshed
If you have several tables on a page, this will cause a performance issue.
Only load data for a visible data table, both on initial load and when tables trigger a resize (which they do when they get shown or hidden).
So if you never visit a tab, its data will never be loaded.